What is the official title of the sketch commonly called Crunchy Frog?

The official title of the sketch commonly called Crunchy Frog is “Trade Description Act.”

The title refers to the British Trade Descriptions Act 1968, which prohibited misleading descriptions of goods. In the sketch, two members of a Hygiene Squad investigate the Whizzo Chocolate Company after discovering that its extravagant sweets do not match their descriptions.

The inspectors question Mr Milton about the Whizzo Quality Assortment, including the notorious Crunchy Frog. His absurd explanation describes a whole chocolate-coated frog and then uses circular logic to justify leaving the bones inside: without the bones, it would not be crunchy. The sketch escalates with other grotesque products such as Ram's Bladder Cup and Anthrax Ripple.

“Crunchy Frog” became the familiar name because it is the sketch's most memorable confection, while “Whizzo Chocolate Company” is another informal label. The original television performance appeared in the first series, and later stage versions made small changes to the dialogue and performers.